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May 7, 929.

G. F. HOPKINS CHUCK Filed Feb. 2'8, 1925 2 Sheets-Sheet m5. .un @.i mk DI @d0 H FI. e O@ wl O Z 05. Z1

61H70: neus May 7, 1929. G, F, HOPKlNS v 1,711,787

CHUCK Filed Feb. 28, 1925 2 sheets-smet 2 George F. Hopkins Patented May '7, 1929.

UNITED STATES 1,711,7811 PATENT OFFICE.

GEORGE F. HOPKINS, OF JACKSON, MICHIGAN;V WILLIAM K. ASAGENDORPIPI EXECU'IOR 0F lSAID GEORGE F. HOPKINS, DECEASED. y

CHUCK.

.Application filled February 28, 1925. Serial No. 12,331.

This invention relates to improvements in chucks. It relates particularly to a lathe chuck adapted for pneumatic control although its features are available in other relations, as for hand manipulation.

1ot' construction and operation will appear from the detailed ydescription to follow.

I accomplish the objects or' the invention by the devices and means described in the following specification. The invention is delined and pointed out in the claims.

A structure embodying a preferred form of my invention isrillustrated in the accompanying drawing, forming a part of this specification, in which: v

Fig. I is a detail perspective view of my improved chuck on a lathe spindle provided with pneumatic control, the parts of thelathe being indicatedv by dotted lines.

Fig. II is an enlarged detail face .elevation view of the chuck, taken from the right handof Fig. I, a portion of the face plate being broken away toshow details of construction.

Fig. III'is van enlarged detailvertical sectional elevation taken on line 3 3 of Figs.

rr, 1v, vana vn.

Fig. Iv is a' Sau 'further ning-@d ,detailV of the jaw structure and'` support, taken on the irregular section line 4 4 of Figs. II, III and V.

Fig. V isan enlarged detail sectionalviewtaken onl line 5 5 of Figs. III and IV showing details of the jaw adjusting screw means.-

Fig. VI is anl enlarged detail face view of the divided jaw supportv for carrying the adj usting screw. Y' 1 .A n'

Fig..VII isfan enlarged detail transverse sectional view taken on line 7 7 of Figs. III and VIII showing details of connection of the bell crank to the draw sleeve.,v

Fig..V `VIII, is anv enlarged-detail perspective view ot the draw sleeve and one of the bell cranks in detached relation.

Fig. IX is an enlarged detail sectional view through the master jaw 8, taken on section 9 9 of Figs. III and IV, showing details of the oil passage and oiling system in that relation.

In the drawing the sectional views are taken looking 1n the direction of the little arrows at the ends of the section lines and similar numerals of reference refer to similar parts throughout the severall views.

The numbered parts of the drawing will be considered by their numbers. 1 is the live spindle of a lathe carrying a pneumatic control means, notdetailed or numbered here,

asthe invention does not relate .to it speclhcally. 2 is the chuck body connected to the lathe spindle by the adapter 3 in the A usual way. 4 is the spider retained and supported within the chuck body and embraced by the face plate 5, through which are disposed screw bolts 6 extending through the face plate and spider and chuck body into the adapter. Additional bolts 7 extend through the tace plate and chuck body for greater security and incidentally to serve toretain the bell crank pivots against longitudinal displacement.

The master jaw`8 is provided with a connecting lug 9 projecting within the spider for assisting in guidingsaid jaw and pro` viding a connecting lug l'or the actuating bell cranks within. Bell cranks 10 are disposed within the spider and are carried by cross pivots 11which are retained in "position against longitudinall displacement lby each being disposed between a pair of'the rsecuring bolts 7 which lare arranged in pairs `for that purpose (see II).

A short arm 101 of each bell crank engages. and actuates ainaster jaw. The end ol the arm is square and'engages a cylindrical bearing member 102 disposed in transverse bearing 91 in the said lug 9 of each jaw 8. These cylindrical bearings are each provided with a longitudinal rectangular slot 103 to cooperate with the square end of the'bell crank arm. A cross pin 104 in the end of arm 101 engages in crossslot 105 in the bearing mem-` ber 102 to prevent lateral displacement of the bearing member. y

Y The long arm member 106 of each bell crank extends radially inward and is connected to the draw sleeve 12 by a similar connection. The central axially reciprocating draw sleeve 12 is provided with transverse bearing seats 121 which receive the cylindrical bearing members 107 which are each longitudinally slotted at 108 to receive the square end of the long arm 106 of each bell crank, so that when thc draw sleeve is reciprocatcd it actuates the bell crank. Each bearing member 107 has cross slot 107 and is engaged by cross pin 109r through the squared end of the lever arm 106, and is thus released in operative position. See Figs. Il, III and VII. There may be two or more bell cranks, opening and closing the chuck jaws simultaneously and accurately centering the same. Three are shown.

The draw sleeve 12 is connected to connecting rod 18 adjustably. The connecting rod 13 contains a central screw-threaded bore at its end and is connected by hollow headed adjusting screw 14 to the said draw sleeve 12. A central screw-threaded nut 15 is at the inner end of the draw sleeve 12 and is journaled on the shank of the screw 14. vlt is retained effectively in place by a pair cf lock nuts 142 which are adjusted on the said screw 14, the threaded end 141 of which extends into the screw-threaded end of the connecting -rod 18. The hollow head of the screw 14 receives a socket wrench (see Figs. 1,11 and VII), and it is possible to adjust the connection of the draw sleeve lto the connecting rod very accurately to secure the proper adjustnient for actuation of the jaws in this way.

The face plate is provided with the master pilot bushing 16 which is secured to the face plate and spider by countersunk hollow headed screws 161 (see Figs. TI and TTI). A detachable cover 17 is placed on this bushing and is detachably held in place by screws 171, so that when it is desired to use the pilot bushing the cover may be removed. For ordinary work the cover is left in place to e1:- clude dust.

The adjustable detachable aws 18 are each carried by the support 20 20 and are adjustable by the screw 19. The support 20 20 is in two parts. This support is retained in place upon the master aw by a pair of screws 201 and each part has laterally projecting transverse ribs 202 engaging in a suitable transverse seat 88 on the master aw 8, which retains these parts'in position. Each part 20-20 is longitudinally grooved at 208 to engage rib 89 on the master jaw-see Figs. 1V and VI. These parts are recessed to receive the adjusting screw 19 which is provided with journals 191 in part 20 and journals 192 in part 20, and disposed in recess 193 in the said support 20 20. Because these parts are made separable7 it facilitates assembling, the screw and journals being made integral. The adjusting screw is controlled by a wrench engaging the square proj ecting end 194.

The adjustable jaw 18 slidably engages this support, a suitable way 181 being provided at one side with threads for engaging the screw 19. A gib 182 is clamped to the opposite side by screw studs 188 provided with screw nuts 184 for clamping and locking the aw in place upon the support 20, 20 after adjust-ment by the screw 19 (see particularly Fig. 1V). From this it will be seen that by manipulation of the adjusting screw 19 the jaws can be each definitely adjusted and set to any position desired, and can then be clamped securely, as indicated.

The master jaws 8 (see Fig. 1V) are provided with laterally projecting slide ribs 82 with beveled outer sides 88 engaging in and extending into suitable ways between the face plate and the spider. These are provided with fiat inner surfaces Aand beveled outer surfaces. Beveled. gibs 84 withbeveled faces 85 co-operate with the same and are Vsecured adjustably in position by hollow headed pointed screws 86 through the face plateengaging corresponding notches in the gibs 84, which enables the taking up of wear at.Y this point and insuring a very close fit between the parts, permitting ofvery accurate adj ustment and secure clamping of theparts.

In the master 8 T provide for lubrication of the various parts, utilizing centrifugal action for properly forcing the lubricant to the different bearings. The radial oil hole 21 (see Fig. TX) is provided with a spring cover 211 at its outer end to prevent discharge of the oil due to the centrifugal action.r This is'made deep into the jaw 8 to form a reservoir for the oil to be delivered outwardly and centrifugally by the rotation of the chuck.

The Cross bore 212 for delivering oil laterally is closed by the screw plug 213. Oil holes 214 and 215 provide oil for the slide ways. An oil hole 216 delivers oil to thebearing 91 for the short arm of the bell` crank. From this it will be seen that when the oil is introduced into the passage and the lchuck is under rotation,.the oil will be forced out centrifugally to these points requiring lubrication. Oil will ooze outl from the bearing 91 and by capillary attraction work down over the bell crank lever and lubricate' the inner end of the same. In the first place the whole structure is lubricated before the chuck is put into position. After a chuck has been put into use, oil will be effectively supplied in this way above described.

The master jaw 8 is provided with aprojecting flange 87 which extends laterally over the face plate 5 of the chuck (see particularly Fig. IV) and serves as a cover for the opening. The inner portion ofthe flange extends over the outer surface of the master Apilot application Serial No. 82,685 filed January 2l, 1926, which is a division of this application.v

Having thus described my invention, what I claim as new and desire to secure by Lettersl Patent is n l. In a lathe chuck, the combination of a recessed chuck body, a spider disposed Within said chuck body and having radial ways and a central axial bore, a face plate with radial ways corresponding` to the ways in said spider, attaching devices Jfor said body, spider and face plate, master jaws having slide ribs disposed in said ways and projecting lugs on the back having transverse bearings, a draw sleeve disposed within the bore of the spider and provided with transverse bearings, actuating bell cranks disposed in the radial ways within the spider and pivoted upon suitable crosspins retained between the same by the said attaching devices, and bearing members on the arms of the bell cranks disposed in the bearings in the said lugs and in the transverse bearings in the draw sleeve, coacting as described for the purpose specified.

2. In a lathe chuck the combination of a suitable chuck body, a spider within the chuck body with radial ways therein forming slideways for master jaws, a face plate therefor with suitable radial openings CorrespondingV te and supplementing the ways in said spider, said face plate adjacent the ways being recessed to form auxiliary ways between the face plate and spider, a master jaw disposed in each of' said radial ways adapted to fit the radial ways of said face plate, each said master jaw having projecting guide ribs extending inte the auxiliary ways, beveled gibs within said auxiliary ways, and pointed set screws disposed in the face plate extending into the front of the face plate and abutting said beveled gibs, coacting as specified.

3. In a lathe chuck, the combination of a chuck body with radial ways formed therein for master jaws, master jaws in said ways with rearward projections and provided wit transverse open-side ournal bearings, a draw sleeve disposed within the said chuck provided with transverse open-side journal bearings, actuating bell crank levers fulcrumed in the chuck head-'with square-end projecting arms, and'journal pin bearings with longitudinal rectangular slots slidably fitting the said bell crank lever arm ends, as specified.

t. In a lathe chuck, the combination of a chuck body with a way for a chuck jaw, a

master jaw in said way provided with a transverse open-side journal bearing, a lever' for actuating said jaw wlth a squared-end bearing portion, and a journal pin with longitudinal bearing slot disposed in said open-side journal bearing and embracing the squared bearing end of said lever, as specified.

5. In a lathe chuck, the combination of a chuck body with a way for a chuck jaw, a master jaw in said way provided with a transverse open-side journal bearing, a lever for actuating said jaw with a squared-end bearing` portion and having a cross pin therethrough, and a journal pin with longitudinal bearing slot and having a central Across slot disposed in said open-side journal bearing and embracing the squared bearing end of said lever, as specified.

In witness whereof, I have hereunto set my hand.

- GEORGE F. HOPKINS. 

